Earth-boring machine.



Patented Nov. 6, 1917.

' Alba/"i mmte ALBERT HUNTER, OF SPOKANE, WASHINGTON.

eanriwoame MACHINE.

Specification of Letters Patent.

' Patented Nov. 6, 1917.

Application filed April 4, 1817. Serial No. 159,828.

To all whom it may concern Be it known that I, ALBERT HUNTER, a citizen of the United States, residing at Spokane, in the county of Spokane and State of Washington, have invented certain new and useful Improvements in Earth- Boring Machines, of which the following is a specification.

My invention relates to earth boring machines, and the object thereof is the provision of a very simple, comparatively inexpensive, portable drill holding and manipulating mechanism of improved and novel construction.

Generally speaking. the apparatus comprises a drill supporting stand adapted to maintain the drilling tool up to its work, revoluble cam-wheels which engage the drill intermediate of its ends and on substantially opposite sides thereof to impart a turning and lifting movement thereto during the intervals between the blows of a hand or power hammer, a lever-controlled mechanism by means of which the turning move ment of the drill may be reversed and the degree of such movement regulated, and means for driving the revoluble cam-wheels.

The various features of construction, combination, arrangement and details of the several parts comprising the complete organi zation, will be hereinafter fully pointed out and described. recourse being had to the accompanying drawings, in which- Figure 1 is a side elevation of the machine, one leg thereof being shown in section.

Fig. 2 is an endwise view in elevation, certain bracket supporting pieces being broken away to better disclose the actuating elements.

Fig. 3 is a top plan view taken on line 33 of Fig. 1.

Fig. 4 is a plan view of the drill retaining devices.

Referring more specifically to the drawings, in which like characters of reference indicate like parts in the several views, it will be observed that the stand which supports the drill and operating mechanism consists of a frame-like structure having four outspreading legs 1 formed integral with the top side members 2. The legs and side members are preferably made of angle-iron, the former being provided with slidably and vertically adjustable ground engaging pins 3 adapted to be secured in adjusted position by set screws 4. A top cross-member 5 and v a lower cross-member 6 are each provided with drill retaining devices similar in design and consisting of arms 7 pivotally mounted on said cross-members at 8 and adapted to loosely encompass the drilling tool so as to allow the tool free revoluble and endwise movement but prevent drifting thereof. The arms may be secured by pins 7.

The mechanism for turning and lifting the drill between blows consists of a pair of U-shaped brackets 9 each pivotally mounted at 10 to supporting pieces 11 which latter are secured to the legs of the frame structure by bolts or rivets 12. Each bracket supports a rotatable shaft 13 which has fixedly mounted thereon a cam-wheel 14 and a pulley-wheel 15. The cam-faces or peripheries 16 of the cam-wheels are adapted to engage opposite sides of the drill when the latter is mounted for operation. The cam-wheels are intended to be rotated in opposite directions by means of the reversing power belting 17 on the pulley-wheels 15 and will thereby impart a slight intermittent turning movement to the drill. The rotation of the cam-wheels will also serve to lift the tool simultaneously with the turning movement, both movements being accomplished during the intervals between the blows on the tool. The belting 17 may be driven from any convenient source of power, not shown.

It is generally desirable and sometimes essential to regulate the degree of revoluble movement of the drilling tool and also to sometimes reverse said movement. I have therefore provided a T-shaped adjusting lever 18 having a handle portion 19 and fingers 20 having yoked ends 21 which engage the protruding ends 22 of the shafts 13. The lever is pivotally mounted on a crosspiece 23 at a point 24. Pivotal movement of the lever serves to swing the brackets 9 on their pivots 10 and to thereby tilt the cam-wheels at varying angles with respect to the drill. When the aXes of these camwheelsthe shafts 13are held on a true horizontal plane said wheels will be maintained in true vertical position and in such position will operate only to lift the tool. 'Bv shifting the lever so as to tilt the camwheels at an angle to the drill it is obvious that a greater or lesser degree of rotation will be imparted thereto. By throwing the lever to one side or the other the direction of rotation of the drill may be reversed. The lever is retained in adjusted position by means of a pawl 25 and a ratchet 26.

While I have illustrated and described a complete embodiment of my invention, it is to be understood that I reserve the right to make such changes in the general organiza tion of the device and in the specific con struction and form of the several elements, without relinquishing my patent rights, as long as, in so doing, I remain within the spirit and scope of the invention as defined inand by-the appended claims.

I claim 1. In combination with a support and a tool carried thereby, of-a pair of brackets pivotally'mounted on the support, a shaft rotatably mounted in each of said brackets, a'c'am-wheel mounted fixedly on each shaft and'adapted to have frictional engagement with said tool, means for adjusting said brackets on their pivots whereby to tilt said cam-wheels, and 7 means for driving said cam-Wheels.

2. In combination with a support and a tool carried thereby, of a pair of brackets pivotally mounted on the support, a shaft rotatably mounted in each of said brackets, a cam-wheel fixedly mounted on each shaft and adapted to engage said tool, an adjusting lever adapted to adjust said brackets on their pivots, drive-Wheels fixedly mounted on said shafts, and means for driving said drivewheels in opposite directions of rotation.

3. In combination with a support and a tool carried thereby, of a pair'of brackets pivotally mounted on the support, a shaft rotatably mounted in each of said brackets, A

a cam-wheel fixedly mounted oneach shaft and adapted to engage said tool, a pivoted adjusting lever mounted on said support and engaging said shafts to adjust said brackets on their pivots, and means for driving said drive-wheels in opposite directions of rotation.

In testimony whereof I afiix my signature.

ALBERT HUNTER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of 'iPate'nts, Washington, D. 0. 

